Pre-breakdown currents in insulating liquids stressed with non-uniform DC electric field

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Abstract

This paper is aimed at investigation of the pre-breakdown conduction characteristics of insulating liquids. Two mineral oils and a synthetic ester fluid were used in the tests. The current-voltage characteristics have been measured in the point-plane electrode configuration, the needle electrode was stressed with positive and negative DC voltage. The current voltage characteristics demonstrated non-linear behavior over a large range of voltages, this current behavior could be attributed to the space-charge saturation regime of conduction in insulating liquids. DC breakdown voltages have been monitored and
registered. It has been shown that MIDEL 7131 synthetic ester has a lower breakdown strength as compared with the tested mineral oils. Also it has been shown that positive breakdown voltage is lower than the negative breakdown
voltage for the insulating liquids used in this study.
Original languageEnglish
Pages452-454
Number of pages3
DOIs
Publication statusPublished - Jun 2009
Event17 IEEE International Pulsed Power Conference -
Duration: 1 Jan 1900 → …

Conference

Conference17 IEEE International Pulsed Power Conference
Period1/01/00 → …

Keywords

  • electric breakdown
  • insulating
  • electrodes
  • electric fields

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